Selective adsorption of zeolite towards nitrosamine in organic solution
Selective adsorption of zeolite towards nitrosamine in organic solution
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DOI：
10.1016/j.micromeso.2008.12.006
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发表时间：
2009-04
影响因子：
5.2
通讯作者：
Jing Yang;X. Dong;Yu Zhou;M. Yue;Chunfang Zhou;F. Wei;J. Zhu;Chuan Liu
中科院分区：
文献类型：
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作者：
Jing Yang;X. Dong;Yu Zhou;M. Yue;Chunfang Zhou;F. Wei;J. Zhu;Chuan Liu
研究了有机溶剂中沸石对4种亚硝胺（N-亚硝基六亚甲基亚胺（NHMI）、N-亚硝基吡咯烷（NPYR）、N-亚硝基去甲烟碱（NNN）和N-亚硝基二苯胺（NDPA））的吸附行为。结果表明，不同孔结构和层次的沸石对亚硝胺具有不同的选择性。该行为一般由吸附质和吸附剂之间的几何匹配：具有较小孔的沸石有利于捕获较小的亚硝胺，而中孔沸石捕获更大的亚硝胺。然而，吸附的大体积NDPA和NNN被发现发生在A型沸石，它具有一个较小的孔径比两个亚硝胺的分子直径。同时，体系中其他硝基化合物的存在对吸附有干扰作用。在所研究的沸石中，CsA和KA可以区分大体积的亚硝胺，例如N-亚硝基二苯胺（NDPA）和硝基化合物（硝基苯）。研究了溶剂对吸附的影响。
Experiments were carried out to study the adsorption of four nitrosamines (N-nitrosohexamethyleneimine (NHMI), N-nitrosopyrrolidine (NPYR), N-nitrosonornicotine (NNN) and N-nirosodiphenylamine (NDPA)) by zeolites in organic solvents. It was found that zeolites of different pore structures and hierarchy exhibited different selectivity towards the nitrosamines. The behavior was generally governed by geometric matching between the adsorbate and adsorbent: zeolites with smaller pores favored the trap of smaller nitrosamines whereas mesoporous zeolites captured more bulky nitrosamines. Nevertheless the adsorption of bulky NDPA and NNN was found to take place on type A zeolite, which has a smaller pore size than the molecular diameter of the two nitrosamines. Meanwhile, the presence of other compounds with nitro group in the system appeared to interfere with the adsorption. Among the zeolites studied, CsA and KA could distinguish the bulky nitrosamines such as N-nitrosodiphenylamine (NDPA) and nitro compounds (nitrobenzene). The influence of the solvent on the adsorption was also studied.